693
FNAK77 PAJK 091827
FWSAJK

Spot Forecast for PortageBay...Coast Guard
National Weather Service Juneau AK
1027 AM AKDT Fri May 9 2025

Forecast is based on forecast start time of 0942 AKDT on May 09.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office at (907) 790-6824, if you have questions
or concerns with this forecast.

.DISCUSSION...A weakening low over the eastern Gulf of Alaska will
see bands of rain and wind race up along its eastern flank into the
SE AK panhandle Friday into Saturday. Winds across much of Frederick
Sound will build to moderate breeze (11 to 16 kt) at times reaching
up to fresh breeze (17 to 21 kt) within the main channels through
Friday. Portage Bay has been reported to be calm winds, with mountains
to the east blocking easterly flow. As of now, these calm winds are expected
to continue with the aloft winds steady from the southeast. Earliest
chance that winds aloft may shift, which would increase winds in the bay,
would be Saturday morning shortly before the front passes to the east.

Winds may diminish briefly this evening before strengthening back to
the aforementioned wind speeds Friday night, potentially reaching
strong breeze (22 to 27 kt) at times as another band moves through.
Conditions will substantially improve Saturday afternoon hours as
winds rapidly drop down towards gentle breeze (7 to 10 kt), and
light breeze (4 to 6 kt) through Saturday night, though chances of
rain could linger into Sunday morning.

.REST OF TODAY...

Chance of pcpn......100 percent.
Min humidity........81 percent.
Dewpoint............42.
Surface winds (kts).South winds 12 to 16 knots. Gusts up to 35 mph
                    decreasing to 25 mph late in the afternoon.
Swell height........North swell 0 feet.
Wave height.........3 feet subsiding to 2 feet late in the
                    afternoon.
Sea surface temp....46 Degrees Fahrenheit.

TIME (AKDT)      9 AM      NOON      3 PM
Chc of pcpn (%).100       100       100
Dewpoint........41        43        43
RH..............87        87        85
SFC wind (kts)..SE 16G30  S 15G24   S 14G25
Swell hgt (ft)..N 0       N 0       N 0
Wave height (ft)3         3         3
SST (F).........46        46        46

.TONIGHT...

Chance of pcpn......100 percent.
Max humidity........91 percent.
Dewpoint............42.
Surface winds (kts).Southeast winds 11 to 16 knots with gusts to
                    around 28 knots.
Swell height........North swell 0 feet.
Wave height.........2 feet building to 3 feet overnight.
Sea surface temp....46 Degrees Fahrenheit.

TIME (AKDT)      6 PM      9 PM      MIDNGT    3 AM
Chc of pcpn (%).100       100       100       100
Dewpoint........43        42        42        41
RH..............82        86        88        88
SFC wind (kts)..S 12G22   SE 11G21  S 12G20   SE 15G26
Swell hgt (ft)..N 0       N 0       N 0       N 0
Wave height (ft)2         2         2         3
SST (F).........46        46        46        46

.SATURDAY...

Chance of pcpn......100 percent.
Min humidity........78 percent.
Dewpoint............41.
Surface winds (kts).Southeast winds 8 to 16 knots with gusts to
                    around 28 knots decreasing to around 5 knots
                    late in the afternoon.
Swell height........North swell 0 feet.
Wave height.........3 feet subsiding to 2 feet in the late morning
                    and afternoon.
Sea surface temp....46 Degrees Fahrenheit.

TIME (AKDT)      6 AM      9 AM      NOON      3 PM
Chc of pcpn (%).100       100       90        80
Dewpoint........40        41        43        42
RH..............89        89        91        83
SFC wind (kts)..SE 16G28  S 15G26   SE 12G22  SE 8G13
Swell hgt (ft)..N 0       N 0       N 0       N 0
Wave height (ft)3         3         2         2
SST (F).........46        46        46        46

$$
Forecaster...Spann
Requested by...Brian Bezenek
Type of request...SAR
.TAG 2513593.1/AJK
.DELDT 05/09/25
.FormatterVersion 2.0.0
.EMAIL sccSoutheastAlaska@uscg.mil